Answer: 1. Treasury bonds are not completely riskless, since their prices will decline when interest rates rise.
2. Walmart
3. Corporate bonds
Step-by-step explanation:
1. Indeed even though Treasury bonds have a very low risk rating, they are not completely risk-less. They have a very low risk rating because they will always be honoured (US T - bonds that is) and so that eliminates the default risk. However, they are still exposed to maturity risk as well as inflation risk for the most part. This means that as interest rates rise therefore, their prices drop making them just a little but risky.
2. Walmart issued the bonds making them the issuer. The rest of the names are Underwriters.
3. Since the bonds were issued by a Corporation being Walmart, the bonds are Corporate Bonds.